/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.planner;

import io.crate.planner.node.dql.Collect;
import io.crate.planner.node.dql.ESGet;
import io.crate.planner.node.dql.QueryThenFetch;
import io.crate.planner.node.dql.join.NestedLoop;
import io.crate.test.integration.CrateDummyClusterServiceUnitTest;
import io.crate.testing.SQLExecutor;
import org.junit.Before;
import org.junit.Test;

import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.instanceOf;

public class SingleRowSubselectPlannerTest extends CrateDummyClusterServiceUnitTest {

    private SQLExecutor e;

    @Before
    public void prepare() {
        e = SQLExecutor.builder(clusterService).enableDefaultTables().build();
    }

    @Test
    public void testPlanSimpleSelectWithSingleRowSubSelectInWhereClause() throws Exception {
        MultiPhasePlan multiPhasePlan = e.plan("select x from t1 where a = (select b from t2)");
        assertThat(multiPhasePlan.rootPlan(), instanceOf(QueryThenFetch.class));
        assertThat(multiPhasePlan.dependencies().keySet(), contains(instanceOf(QueryThenFetch.class)));
    }

    @Test
    public void testPlanSelectOnSysTablesWithSingleRowSubselectInWhere() throws Exception {
        MultiPhasePlan plan = e.plan("select name from sys.cluster where name = (select 'foo')");
        assertThat(plan.rootPlan(), instanceOf(Collect.class));
        assertThat(plan.dependencies().keySet(), contains(instanceOf(Collect.class)));
    }

    @Test
    public void testSingleRowSubSelectInSelectList() throws Exception {
        MultiPhasePlan plan = e.plan("select (select b from t2 limit 1) from t1");

        assertThat(plan.rootPlan(), instanceOf(Collect.class));
        assertThat(plan.dependencies().keySet(), contains(instanceOf(QueryThenFetch.class)));
        assertThat(((QueryThenFetch) plan.dependencies().keySet().iterator().next()).subPlan(), instanceOf(Collect.class));
    }

    @Test
    public void testSingleRowSubSelectAndDocKeysInWhereClause() throws Exception {
        MultiPhasePlan plan = e.plan("select (select 'foo' from sys.cluster) from users where id = 10");
        assertThat(plan.rootPlan(), instanceOf(ESGet.class));
        assertThat(plan.dependencies().keySet(), contains(instanceOf(Collect.class)));
    }

    @Test
    public void testSingleRowSubSelectOfWhereInJoin() throws Exception {
        QueryThenFetch plan = e.plan("select * from users u1, users u2 where u1.name = (select 'Arthur')");
        assertThat(plan.subPlan(), instanceOf(NestedLoop.class));
        assertThat(((NestedLoop) plan.subPlan()).left(), instanceOf(MultiPhasePlan.class));
    }
}